import { Request, Response, NextFunction } from 'express';
import logger from '@utils/logger';

/**
 * 系统控制器
 */
class SystemController {
  /**
   * 获取系统完整状态
   */
  async getSystemStatus(req: Request, res: Response, next: NextFunction): Promise<void> {
    try {
      const status = {
        timestamp: new Date().toISOString(),
        uptime: process.uptime(),
        environment: process.env.NODE_ENV || 'development',
        version: '1.0.0',

        // 服务健康状态
        services: {
          backend: {
            status: 'healthy',
            uptime: process.uptime(),
            memory: {
              used: Math.round(process.memoryUsage().heapUsed / 1024 / 1024),
              total: Math.round(process.memoryUsage().heapTotal / 1024 / 1024),
              unit: 'MB'
            },
            cpu: {
              usage: process.cpuUsage(),
              loadAverage: process.platform !== 'win32' ? (require('os').loadavg() as number[]) : []
            }
          },
          database: {
            mongodb: { status: 'connected', latency: 5 },
            redis: { status: 'connected', latency: 2 }
          },
          microservices: {
            'api-gateway': { status: 'running', port: 8080 },
            'alert-service': { status: 'running', port: 50051 },
            'ticket-service': { status: 'running', port: 50052 },
            'ai-gateway': { status: 'running', port: 50053 },
            'notification-service': { status: 'running', port: 50054 },
            'user-service': { status: 'running', port: 50055 },
            'integration-service': { status: 'running', port: 50056 }
          },
          monitoring: {
            prometheus: { status: 'running', port: 9090 },
            grafana: { status: 'running', port: 3001 },
            alertmanager: { status: 'running', port: 9093 }
          }
        },

        // 系统指标
        metrics: {
          requests: {
            total: 0,
            success: 0,
            failed: 0,
            avgResponseTime: 0
          },
          alerts: {
            total: 0,
            active: 0,
            resolved: 0
          },
          tickets: {
            total: 0,
            open: 0,
            inProgress: 0,
            resolved: 0,
            closed: 0
          }
        },

        // 系统资源
        resources: {
          disk: {
            used: '2.5GB',
            total: '10GB',
            percentage: 25
          },
          network: {
            rx: '1.2GB',
            tx: '850MB'
          }
        }
      };

      res.status(200).json({
        success: true,
        data: status,
      });
    } catch (error) {
      logger.error('Failed to get system status:', error as Error);
      next(error);
    }
  }

  /**
   * 获取系统指标
   */
  async getMetrics(req: Request, res: Response, next: NextFunction): Promise<void> {
    try {
      const metrics = {
        timestamp: new Date().toISOString(),

        // 性能指标
        performance: {
          requestsPerSecond: 125,
          avgResponseTime: 45,
          p95ResponseTime: 120,
          p99ResponseTime: 250,
          errorRate: 0.5
        },

        // 业务指标
        business: {
          alerts: {
            received: 1250,
            processed: 1200,
            pending: 50
          },
          tickets: {
            created: 450,
            resolved: 380,
            avgResolutionTime: 4.5
          },
          users: {
            active: 25,
            total: 100
          }
        },

        // 系统指标
        system: {
          cpu: {
            usage: 45,
            cores: 8
          },
          memory: {
            used: Math.round(process.memoryUsage().heapUsed / 1024 / 1024),
            total: Math.round(process.memoryUsage().heapTotal / 1024 / 1024),
            percentage: Math.round((process.memoryUsage().heapUsed / process.memoryUsage().heapTotal) * 100)
          },
          network: {
            bytesIn: 1250000000,
            bytesOut: 850000000,
            connectionsActive: 150
          }
        }
      };

      res.status(200).json({
        success: true,
        data: metrics,
      });
    } catch (error) {
      logger.error('Failed to get metrics:', error as Error);
      next(error);
    }
  }

  /**
   * 获取服务依赖图
   */
  async getDependencies(req: Request, res: Response, next: NextFunction): Promise<void> {
    try {
      const dependencies = {
        nodes: [
          { id: 'api-gateway', type: 'gateway', status: 'healthy' },
          { id: 'alert-service', type: 'service', status: 'healthy' },
          { id: 'ticket-service', type: 'service', status: 'healthy' },
          { id: 'ai-gateway', type: 'service', status: 'healthy' },
          { id: 'notification-service', type: 'service', status: 'healthy' },
          { id: 'user-service', type: 'service', status: 'healthy' },
          { id: 'integration-service', type: 'service', status: 'healthy' },
          { id: 'mongodb', type: 'database', status: 'healthy' },
          { id: 'redis', type: 'cache', status: 'healthy' },
          { id: 'prometheus', type: 'monitoring', status: 'healthy' }
        ],
        edges: [
          { from: 'api-gateway', to: 'alert-service', type: 'grpc' },
          { from: 'api-gateway', to: 'ticket-service', type: 'grpc' },
          { from: 'api-gateway', to: 'ai-gateway', type: 'grpc' },
          { from: 'api-gateway', to: 'integration-service', type: 'grpc' },
          { from: 'alert-service', to: 'mongodb', type: 'database' },
          { from: 'ticket-service', to: 'mongodb', type: 'database' },
          { from: 'notification-service', to: 'redis', type: 'cache' },
          { from: 'prometheus', to: 'api-gateway', type: 'scrape' }
        ]
      };

      res.status(200).json({
        success: true,
        data: dependencies,
      });
    } catch (error) {
      logger.error('Failed to get dependencies:', error as Error);
      next(error);
    }
  }

  /**
   * 获取系统日志
   */
  async getLogs(req: Request, res: Response, next: NextFunction): Promise<void> {
    try {
      const { level = 'all', limit = 100, service } = req.query;

      const logs = [
        {
          timestamp: new Date().toISOString(),
          level: 'info',
          service: 'api-gateway',
          message: 'Request processed successfully',
          metadata: { method: 'GET', path: '/api/tickets', duration: 45 }
        },
        {
          timestamp: new Date(Date.now() - 60000).toISOString(),
          level: 'warn',
          service: 'alert-service',
          message: 'High alert volume detected',
          metadata: { count: 150, threshold: 100 }
        },
        {
          timestamp: new Date(Date.now() - 120000).toISOString(),
          level: 'error',
          service: 'ticket-service',
          message: 'Failed to update ticket status',
          metadata: { ticketId: 'TK-20251007-0001', error: 'Connection timeout' }
        }
      ];

      res.status(200).json({
        success: true,
        data: {
          logs: logs.slice(0, parseInt(limit as string, 10)),
          total: logs.length
        },
      });
    } catch (error) {
      logger.error('Failed to get logs:', error as Error);
      next(error);
    }
  }
}

export default new SystemController();
